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Lifetime of Polyethylene (PE) Pipe Material—Prediction Using Strain Hardening Test

  • E. Nezbedová
  • J. Hodan
  • J. Kotek
  • Z. Krulis
  • P. Hutař
  • R. Lach
Chapter
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 247)

Abstract

Pipe failure in long-term applications is characterised by creep crack initiation and creep crack growth. Both can be determined by fracture mechanics-based tests of the pipe materials. Nowadays, several accelerated tests are available: PENT (Pennsylvania Edge Notch Tensile Test), FNCT (Full Notch Creep Tensile Test), CRB (Cracked Round Bar Test) or SHT (Strain Hardening Test) and NCBT (Notched Cylindrical Bars Test). The PENT, CRB and SHT were applied to one unimodal polyethylene (PE 80), four bimodal polyethylene (three of PE 100 and one of PE 100-RC) and one PE-BF (for blow molding). The contribution is focused mainly on two topics: (i) difference in specimen’s preparation and test conditions and (ii) comparison of the experimental results obtained using different accelerated tests.

Notes

Acknowledgement

This research was supported by the Czech Science Foundation by grant No. P108/12/1560.

References

  1. 1.
    Lu, X., Brown, N.: A test for slow crack growth failure in polyethylene under a constant load. Polym. Test. 11, 309–319 (1992)CrossRefGoogle Scholar
  2. 2.
    Nezbedová, E., Kučera, J., Zahradnickova, A.: Relation of slow crack growth failure time to structure of HDPE. Mech. Time-Depend. Mater. 5, 67–78 (2001)CrossRefGoogle Scholar
  3. 3.
    Hessel, J.: „PE 100-RC“—Ein PE 100 mit erweitertem Anwendungspotenzial. 3R Int. 47, 189–193 (2008)Google Scholar
  4. 4.
    Jivraj, N., Sehanobish, K., Dun, J.V., Damen, J., Wu, S.: Ductile failure and delayed necking in polyethylene. In: Proceedings of Plastic Pipes XI (Munich, 03.–06.09.2001), pp. 697–704. Munich (2001)Google Scholar
  5. 5.
    Castagnetti, D., Dragoni, E., Simonazzi, C.: Quality assessment of HDPE pipes by mechanical testing. In: Proceedings of Plastic Pipes XII (Milano, 19.–22.04.2004), Session 10b. Milano (2004)Google Scholar
  6. 6.
    Kurelec, L., Teeuwen, M., Schoffeleers, H., Deblieck, R.: Strain hardening modulus as a measure of environmental stress crack resistance of high density polyethylene. Polymer 46, 6369–6379 (2005)CrossRefGoogle Scholar
  7. 7.
    Deblieck, R., van Beek, D.J.M., Remerie, K., Ward, I.M.: Failure mechanism in polyolefines. The role of crazing, shear yielding and the entanglement network. Polymer 52, 2979–2990 (2011)CrossRefGoogle Scholar
  8. 8.
    Van der Stock, E., Scholten, F.: Strain hardening test on PE pipe materials. In: Proceedings of Plastic Pipes XVI (Barcelona, 24.–26.09.2012), 10 p. Barcelona (2012)Google Scholar
  9. 9.
    ISO 16241 (2005): Notch tensile test to measure the resistance to slow crack growth of polyethylene materials for pipe and fitting products (PENT)Google Scholar
  10. 10.
    Nezbedová, E., Kučera, J.: Experimentelle Methoden zur Charakterisierung des Bruchverhal tens von HDPE-Rohren. In: Grellmann, W., Seidler, S. (eds.) Deformation und Bruchverhalten von Kunststoffen. Springer, Berlin (1998), pp. 91–98Google Scholar
  11. 11.
    ISO 16770 (2004): Plastics—Determination of environmental stress cracking (ESC) of polyethylene—Full-notch creep test (FNCT)Google Scholar
  12. 12.
    ISO 18488 (2015): Polyethylene (PE) Materials for piping systems—Determination of strain hardening modulus in relation to slow crack growth—Test methodGoogle Scholar

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • E. Nezbedová
    • 1
  • J. Hodan
    • 2
  • J. Kotek
    • 2
  • Z. Krulis
    • 2
  • P. Hutař
    • 3
  • R. Lach
    • 4
  1. 1.Polymer Institute BrnoBrnoCzech Republic
  2. 2.Academy of Sciences of the Czech RepublicInstitute of Macromolecular ChemistryPragueCzech Republic
  3. 3.Academy of Sciences of the Czech RepublicInstitute of Physics of MaterialsBrnoCzech Republic
  4. 4.Polymer Service GmbH Merseburg, Associated An-Institute of University of Applied Sciences MerseburgMerseburgGermany

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